Familiarity gives rise to contempt.
The quarrels of friends are the opportunities of foes.
In critical moments even the very powerful have need of the weakest.
If you are wise you won't be deceived by the innocent airs of those whom you have once found to be dangerous.
Those who voluntarily put power into the hands of a tyrant ... must not wonder if it be at last turned against themselves.
Facts speak plainer than words